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So far this is the oldest known Sekai BMX advertisement. It shows the model “Superhawk” (#350). You can see the similarities to my own unknown 1977. But the ad says announcing Sekai BMX. Does this mean 1977 was the first year Sekai made a BMX bike? If so was my 77 made at the same place as this 79? If so who made the 79 for Sekai?